'\" et
.TH nl_types.h "0P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\"
.SH PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
.\"
.SH NAME
nl_types.h
\(em data types
.SH SYNOPSIS
.LP
.nf
#include <nl_types.h>
.fi
.SH DESCRIPTION
The
.IR <nl_types.h> 
header shall define at least the following types:
.IP "\fBnl_catd\fP" 14
Used by the message catalog functions
\fIcatopen\fR(),
\fIcatgets\fR(),
and
\fIcatclose\fR()
to identify a catalog descriptor.
.IP "\fBnl_item\fP" 14
Used by
\fInl_langinfo\fR()
to identify items of
.IR langinfo
data. Values of objects of type
.BR nl_item
are defined in
.IR <langinfo.h> .
.P
The
.IR <nl_types.h> 
header shall define at least the following symbolic constants:
.IP NL_SETD 14
Used by
.IR gencat
when no $\fIset\fP directive is specified in a message text source
file. This constant can be passed as the value of
.IR set_id
on subsequent calls to
\fIcatgets\fR()
(that is, to retrieve messages from the default message set). The
value of NL_SETD is implementation-defined.
.IP NL_CAT_LOCALE 14
Value that must be passed as the
.IR oflag
argument to
\fIcatopen\fR()
to ensure that message catalog selection depends on the
.IR LC_MESSAGES
locale category, rather than directly on the
.IR LANG
environment variable.
.P
The following shall be declared as functions and may also be defined as
macros. Function prototypes shall be provided.
.sp
.RS 4
.nf

int       catclose(nl_catd);
char     *catgets(nl_catd, int, int, const char *);
nl_catd   catopen(const char *, int);
.fi
.P
.RE
.LP
.IR "The following sections are informative."
.SH "APPLICATION USAGE"
None.
.SH RATIONALE
None.
.SH "FUTURE DIRECTIONS"
None.
.SH "SEE ALSO"
.IR "\fB<langinfo.h>\fP"
.P
The System Interfaces volume of POSIX.1\(hy2017,
.IR "\fIcatclose\fR\^(\|)",
.IR "\fIcatgets\fR\^(\|)",
.IR "\fIcatopen\fR\^(\|)",
.IR "\fInl_langinfo\fR\^(\|)"
.P
The Shell and Utilities volume of POSIX.1\(hy2017,
.IR "\fIgencat\fR\^"
.\"
.SH COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1-2017, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, 2018 Edition,
Copyright (C) 2018 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
In the event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
.PP
Any typographical or formatting errors that appear
in this page are most likely
to have been introduced during the conversion of the source files to
man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
